3 Threads Printing numbers in sequence

Question

I am trying to write a simple code to print numbers in sequence. Scenario is like

Thread  Number
T1        1
T2        2
T3        3
T1        4
T2        5
T3          


        

Answer 1

    package com.sourav.mock.Thread;

    import java.util.concurrent.atomic.AtomicInteger;

    public class ThreeThreadComunication implements Runnable {
        AtomicInteger counter;
        int[] array;
        static final Object mutex = new Object();

        public ThreeThreadComunication(int[] array, AtomicInteger counter){
            this.counter = counter;
            this.array = array;
        }

        @Override
        public void run() {
            int i = 0;
            while(i < array.length){
                synchronized(mutex){
                    if(Integer.parseInt(Thread.currentThread().getName()) == counter.get()){
                        System.out.println(array[i]);
                        if(counter.get() == 3){
                            counter.getAndSet(1);
                        }else{
                            int c = counter.get();
                            counter.getAndSet(++c);
                        }
                        i++;
                    }

                    mutex.notifyAll();
                    try {
                        mutex.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }

package com.sourav.mock.Thread;

import java.util.concurrent.atomic.AtomicInteger;

public class ThreeThreadComunicationTest {

    public static void main(String[] args) {

        AtomicInteger counter = new AtomicInteger(1);
        int[] array1 = new int[]{1, 4, 7};
        int[] array2 = new int[]{2, 5, 8};
        int[] array3 = new int[]{3, 6, 9};

        ThreeThreadComunication obj1 = new ThreeThreadComunication(array1, counter);
        ThreeThreadComunication obj2 = new ThreeThreadComunication(array2, counter);
        ThreeThreadComunication obj3 = new ThreeThreadComunication(array3, counter);

        Thread t1 = new Thread(obj1, "1");
        Thread t2 = new Thread(obj2, "2");
        Thread t3 = new Thread(obj3, "3");

        t1.start();
        t2.start();
        t3.start();
    }

}